WO2014193104A1 - Procédé et terminal de réception d'un epdcch en provenance d'une petite cellule disposant d'une faible puissance d'émission - Google Patents

Procédé et terminal de réception d'un epdcch en provenance d'une petite cellule disposant d'une faible puissance d'émission Download PDF

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Publication number
WO2014193104A1
WO2014193104A1 PCT/KR2014/004315 KR2014004315W WO2014193104A1 WO 2014193104 A1 WO2014193104 A1 WO 2014193104A1 KR 2014004315 W KR2014004315 W KR 2014004315W WO 2014193104 A1 WO2014193104 A1 WO 2014193104A1
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Prior art keywords
epdcch
subframe
cell
prb
small cell
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PCT/KR2014/004315
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English (en)
Korean (ko)
Inventor
유향선
이윤정
안준기
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엘지전자 주식회사
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Priority to US14/894,169 priority Critical patent/US10045337B2/en
Publication of WO2014193104A1 publication Critical patent/WO2014193104A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences

Definitions

  • the present invention relates to mobile communications.
  • 3GPP LTE long term evolution
  • UMTS Universal Mobile Telecommunications System
  • 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink and single carrier-frequency division multiple access (SC-FDMA) in uplink.
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier-frequency division multiple access
  • MIMO multiple input multiple output
  • LTE-A 3GPP LTE-Advanced
  • the physical channel in LTE is a downlink channel PDSCH (Physical Downlink) It may be divided into a shared channel (PDCCH), a physical downlink control channel (PDCCH), a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH) which are uplink channels.
  • PDSCH Physical Downlink
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • the PDCCH is monitored in a limited region called a control region in a subframe, and the CRS transmitted in all bands is used for demodulation of the PDCCH.
  • the types of control information are diversified and the amount of control information is increased, the scheduling flexibility is inferior only with the existing PDCCH.
  • EPDCCH enhanced PDCCH
  • the present disclosure aims to solve the above-mentioned problem.
  • one disclosure of the present disclosure provides a method for receiving an Enhanced Physical Downlink Control Channel (EPDCCH) from a small cell having a low power transmission power.
  • the receiving method includes receiving EPDCCH-PRB set information including information on a physical resource block (PRB) for receiving an EPDCCH from the small cell; And determining the subframe in which the EPDCCH is to be received from the small cell on the PRB identified by the EPDCCH-PRB set information.
  • the subframe in which the EPDCCH can be received from the small cell may be determined not to overlap with the subframe in which the EPDCCH is transmitted by one or a plurality of neighboring cells.
  • the PRB to transmit the EPDCCH may be determined by a set of PRBs, a bundle of PRBs, or a group of PRBs.
  • zero-power transmission may be performed by the small cell on the PRB.
  • zero power transmission may be performed by the one or a plurality of neighboring cells on a subframe in which the EPDCCH is determined to be received from the small cell.
  • the EPDCCH transmission method may include: determining, by the small cell, a physical resource block (PRB) to transmit an EPDCCH;
  • the small cell on the determined PRB may include determining a subframe to transmit the EPDCCH.
  • the subframe may be determined not to overlap with the subframe in which the EPDCCH is transmitted by one or a plurality of neighbor cells.
  • the PRB to transmit the EPDCCH may be determined by a set of PRBs, a bundle of PRBs, or a group of PRBs.
  • the EPDCCH transmission method may further include transmitting EPDCCH-PRB set information including information on a PRB determined to transmit the EPDCCH to the terminal.
  • zero power transmission may be performed by the small cell on the PRB.
  • zero power transmission may be performed by the one or a plurality of neighbor cells on a subframe in which the EPDCCH is determined to be transmitted.
  • one disclosure of the present specification also provides a terminal for receiving an Enhanced Physical Downlink Control Channel (EPDCCH) from a small cell having a low power transmission power.
  • the terminal includes a receiving unit for receiving EPDCCH-PRB set information including information on a physical resource block (PRB) to receive the EPDCCH from the small cell; And a processor for determining a subframe in which the EPDCCH is to be received from the small cell on the PRB identified by the EPDCCH-PRB set information.
  • the subframe in which the EPDCCH can be received from the small cell may be determined not to overlap with the subframe in which the EPDCCH is transmitted by one or a plurality of neighboring cells.
  • 1 is a wireless communication system.
  • FIG. 2 shows a structure of a radio frame according to FDD in 3GPP LTE.
  • 3 shows a structure of a downlink radio frame according to TDD in 3GPP LTE.
  • FIG. 4 is an exemplary diagram illustrating a resource grid for one uplink or downlink slot in 3GPP LTE.
  • 5 shows a structure of a downlink subframe.
  • FIG. 6 shows a structure of an uplink subframe in 3GPP LTE.
  • FIG. 7 is a comparative example of a single carrier system and a carrier aggregation system.
  • FIG. 8 illustrates cross-carrier scheduling in a carrier aggregation system.
  • 9 is an example of a subframe having an EPDCCH.
  • 10A exemplarily illustrates a new carrier for a next generation wireless communication system.
  • 10B is a diagram illustrating an environment of a mixed heterogeneous network of macro cells and small cells, which may be a next generation wireless communication system.
  • FIG. 11 shows an example of interference management of an EPDCCH on a subframe basis according to the first disclosure of the present specification.
  • FIG. 12 illustrates an example in which interference management of an EPDCCH based on subframes according to the first disclosure of the present specification illustrated in FIG. 11 is applied.
  • FIG. 13 shows an example of interference management of an EPDCCH through scheduling for multiple subframes according to the second disclosure of the present specification.
  • FIG. 14 shows an example for interference management of an EPREGCH based on an EREG / ECCE unit according to the third disclosure of the present specification.
  • FIG. 15 shows an example of interference management of an EPREGCH based on an EREG unit according to the third disclosure of the present specification.
  • 16A to 16C illustrate an example of interference management of an ECCE unit based EPDCCH according to a third disclosure of the present specification.
  • FIG. 17 illustrates an example of managing DMRS resources in order to efficiently manage interference of an EPDCCH according to a fourth disclosure of the present specification.
  • FIG. 19 is a block diagram illustrating a wireless communication system in which a disclosure of the present specification is implemented.
  • LTE includes LTE and / or LTE-A.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
  • base station which is used hereinafter, generally refers to a fixed station for communicating with a wireless device, and includes an evolved-nodeb (eNodeB), an evolved-nodeb (eNB), a base transceiver system (BTS), and an access point (e. Access Point) may be called.
  • eNodeB evolved-nodeb
  • eNB evolved-nodeb
  • BTS base transceiver system
  • access point e. Access Point
  • UE User Equipment
  • MS mobile station
  • UT user terminal
  • SS subscriber station
  • MT mobile terminal
  • 1 is a wireless communication system.
  • a wireless communication system includes at least one base station (BS) 20.
  • Each base station 20 provides a communication service for a particular geographic area (generally called a cell) 20a, 20b, 20c.
  • the cell can in turn be divided into a number of regions (called sectors).
  • the UE typically belongs to one cell, and the cell to which the UE belongs is called a serving cell.
  • a base station that provides a communication service for a serving cell is called a serving BS. Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is called a neighbor cell.
  • a base station that provides communication service for a neighbor cell is called a neighbor BS. The serving cell and the neighbor cell are determined relatively based on the UE.
  • downlink means communication from the base station 20 to the UE 10
  • uplink means communication from the UE 10 to the base station 20.
  • the transmitter may be part of the base station 20 and the receiver may be part of the UE 10.
  • the transmitter may be part of the UE 10 and the receiver may be part of the base station 20.
  • the wireless communication system includes a multiple-input multiple-output (MIMO) system, a multiple-input single-output (MIS) system, a single-input single-output (SISO) system, and a single-input multiple-output (SIMO) system.
  • MIMO multiple-input multiple-output
  • MIS multiple-input single-output
  • SISO single-input single-output
  • SIMO single-input multiple-output
  • the MIMO system uses a plurality of transmit antennas and a plurality of receive antennas.
  • the MISO system uses multiple transmit antennas and one receive antenna.
  • the SISO system uses one transmit antenna and one receive antenna.
  • the SIMO system uses one transmit antenna and multiple receive antennas.
  • the transmit antenna means a physical or logical antenna used to transmit one signal or stream
  • the receive antenna means a physical or logical antenna used to receive one signal or stream.
  • a wireless communication system can be largely divided into a frequency division duplex (FDD) method and a time division duplex (TDD) method.
  • FDD frequency division duplex
  • TDD time division duplex
  • uplink transmission and downlink transmission are performed while occupying different frequency bands.
  • uplink transmission and downlink transmission are performed at different times while occupying the same frequency band.
  • the channel response of the TDD scheme is substantially reciprocal. This means that the downlink channel response and the uplink channel response are almost the same in a given frequency domain. Therefore, in a TDD based wireless communication system, the downlink channel response can be obtained from the uplink channel response.
  • the downlink transmission by the base station and the uplink transmission by the UE cannot be simultaneously performed.
  • uplink transmission and downlink transmission are performed in different subframes.
  • FIG. 2 shows a structure of a radio frame according to FDD in 3GPP LTE.
  • the radio frame illustrated in FIG. 2 may refer to section 5 of 3GPP TS 36.211 V10.4.0 (2011-12) "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 10)".
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • Physical Channels and Modulation Release 10
  • a radio frame includes 10 subframes, and one subframe includes two slots. Slots in a radio frame are numbered from 0 to 19 slots.
  • the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI may be referred to as a scheduling unit for data transmission.
  • one radio frame may have a length of 10 ms
  • one subframe may have a length of 1 ms
  • one slot may have a length of 0.5 ms.
  • the structure of the radio frame is merely an example, and the number of subframes included in the radio frame or the number of slots included in the subframe may be variously changed.
  • one slot may include a plurality of OFDM symbols. How many OFDM symbols are included in one slot may vary depending on a cyclic prefix (CP).
  • CP cyclic prefix
  • 3 shows a structure of a downlink radio frame according to TDD in 3GPP LTE.
  • the radio frame includes 10 subframes indexed from 0 to 9.
  • One subframe includes two consecutive slots.
  • the time it takes for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI transmission time interval
  • one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.
  • One slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain.
  • OFDM symbol is only for representing one symbol period in the time domain, since 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink (DL), multiple access scheme or name There is no limit on.
  • OFDM symbol may be called another name such as a single carrier-frequency division multiple access (SC-FDMA) symbol, a symbol period, and the like.
  • SC-FDMA single carrier-frequency division multiple access
  • One slot includes 7 OFDM symbols as an example, but the number of OFDM symbols included in one slot may vary according to the length of the CP.
  • One slot in a normal CP includes 7 OFDM symbols, and one slot in an extended CP includes 6 OFDM symbols.
  • a resource block is a resource allocation unit and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in the time domain and the resource block includes 12 subcarriers in the frequency domain, one resource block includes 7 ⁇ 12 resource elements (REs). It may include.
  • a subframe having indexes # 1 and # 6 is called a special subframe and includes a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
  • DwPTS is used for initial cell search, synchronization or channel estimation at the UE.
  • UpPTS is used to synchronize channel estimation at the base station with uplink transmission synchronization of the UE.
  • GP is a section for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • DL subframe In TDD, a downlink (DL) subframe and an uplink (UL) subframe coexist in one radio frame.
  • Table 1 shows an example of configuration of a radio frame.
  • 'D' represents a DL subframe
  • 'U' represents a UL subframe
  • 'S' represents a special subframe.
  • the UE may know which subframe is the DL subframe or the UL subframe according to the configuration of the radio frame.
  • the DL (downlink) subframe is divided into a control region and a data region in the time domain.
  • the control region includes up to three OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed.
  • PDCCH and other control channels are allocated to the control region, and PDSCH is allocated to the data region.
  • FIG. 4 is an exemplary diagram illustrating a resource grid for one uplink or downlink slot in 3GPP LTE.
  • an uplink slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain, and includes N RB resource blocks ( RBs ) in a frequency domain. Include.
  • the number of resource blocks (RBs), that is, NRBs may be any one of 6 to 110.
  • an example of one resource block includes 7 ⁇ 12 resource elements including 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain, but the number of subcarriers and OFDM symbols in the resource block is equal to this. It is not limited.
  • the number of OFDM symbols or the number of subcarriers included in the resource block may be variously changed. That is, the number of OFDM symbols may change according to the length of the above-described CP.
  • 3GPP LTE defines that 7 OFDM symbols are included in one slot in the case of a normal CP, and 6 OFDM symbols are included in one slot in the case of an extended CP.
  • the OFDM symbol is for representing one symbol period, and may be referred to as an SC-FDMA symbol, an OFDMA symbol, or a symbol period according to a system.
  • the RB includes a plurality of subcarriers in the frequency domain in resource allocation units.
  • the number N UL of resource blocks included in an uplink slot depends on an uplink transmission bandwidth set in a cell.
  • Each element on the resource grid is called a resource element.
  • the number of subcarriers in one OFDM symbol can be used to select one of 128, 256, 512, 1024, 1536 and 2048.
  • a resource grid for one uplink slot may be applied to a resource grid for a downlink slot.
  • 5 shows a structure of a downlink subframe.
  • 7 OFDM symbols are included in one slot by assuming a normal CP.
  • the number of OFDM symbols included in one slot may change according to the length of a cyclic prefix (CP). That is, as described above, according to 3GPP TS 36.211 V10.4.0, one slot includes 7 OFDM symbols in a normal CP, and one slot includes 6 OFDM symbols in an extended CP.
  • CP cyclic prefix
  • a resource block is a resource allocation unit and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in the time domain and the resource block includes 12 subcarriers in the frequency domain, one resource block includes 7 ⁇ 12 resource elements (REs). It may include.
  • the DL (downlink) subframe is divided into a control region and a data region in the time domain.
  • the control region includes up to three OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed.
  • a physical downlink control channel (PDCCH) and another control channel are allocated to the control region, and a PDSCH is allocated to the data region.
  • PDCH physical downlink control channel
  • physical channels include a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), a physical downlink control channel (PDCCH), a physical control format indicator channel (PCFICH), and a physical hybrid (PHICH).
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • PDCCH physical downlink control channel
  • PCFICH physical control format indicator channel
  • PHICH physical hybrid
  • ARQ Indicator Channel Physical Uplink Control Channel
  • the PCFICH transmitted in the first OFDM symbol of a subframe carries a control format indicator (CFI) regarding the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
  • CFI control format indicator
  • the wireless device first receives the CFI on the PCFICH and then monitors the PDCCH.
  • the PCFICH does not use blind decoding and is transmitted on a fixed PCFICH resource of a subframe.
  • the PHICH carries a positive-acknowledgement (ACK) / negative-acknowledgement (NACK) signal for a UL hybrid automatic repeat request (HARQ).
  • ACK positive-acknowledgement
  • NACK negative-acknowledgement
  • HARQ UL hybrid automatic repeat request
  • the Physical Broadcast Channel (PBCH) is transmitted in the preceding four OFDM symbols of the second slot of the first subframe of the radio frame.
  • the PBCH carries system information necessary for the wireless device to communicate with the base station, and the system information transmitted through the PBCH is called a master information block (MIB).
  • MIB master information block
  • SIB system information block
  • the PDCCH includes resource allocation and transmission format of downlink-shared channel (DL-SCH), resource allocation information of uplink shared channel (UL-SCH), paging information on PCH, system information on DL-SCH, and random access transmitted on PDSCH. Resource allocation of higher layer control messages such as responses, sets of transmit power control commands for individual UEs in any UE group, activation of voice over internet protocol (VoIP), and the like.
  • a plurality of PDCCHs may be transmitted in the control region, and the UE may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted on an aggregation of one or several consecutive control channel elements (CCEs).
  • CCEs control channel elements
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups.
  • the format of the PDCCH and the number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
  • DCI downlink control information
  • PDSCH also called DL grant
  • PUSCH resource allocation also called UL grant
  • VoIP Voice over Internet Protocol
  • the base station determines the PDCCH format according to the DCI to be sent to the UE, and attaches a cyclic redundancy check (CRC) to the control information.
  • CRC cyclic redundancy check
  • RNTI a unique radio network temporary identifier
  • the PDCCH is for a specific UE, a unique identifier of the UE, for example, a cell-RNTI (C-RNTI) may be masked to the CRC.
  • C-RNTI cell-RNTI
  • a paging indication identifier for example, p-RNTI (P-RNTI) may be masked to the CRC.
  • SI-RNTI system information-RNTI
  • RA-RNTI random access-RNTI
  • blind decoding is used to detect the PDCCH.
  • Blind decoding is a method of demasking a desired identifier in a cyclic redundancy check (CRC) of a received PDCCH (referred to as a candidate PDCCH) and checking a CRC error to determine whether the corresponding PDCCH is its control channel.
  • the base station determines the PDCCH format according to the DCI to be sent to the wireless device, attaches the CRC to the DCI, and masks a unique identifier (referred to as Radio Network Temporary Identifier (RNTI)) to the CRC according to the owner or purpose of the PDCCH.
  • RNTI Radio Network Temporary Identifier
  • the uplink channel includes a PUSCH, a PUCCH, a sounding reference signal (SRS), and a physical random access channel (PRACH).
  • PUSCH PUSCH
  • PUCCH Physical Uplink Control Channel
  • SRS sounding reference signal
  • PRACH physical random access channel
  • FIG. 6 shows a structure of an uplink subframe in 3GPP LTE.
  • an uplink subframe may be divided into a control region and a data region in the frequency domain.
  • a physical uplink control channel (PUCCH) for transmitting uplink control information is allocated to the control region.
  • the data area is allocated a PUSCH (Physical Uplink Shared Channel) for transmitting data (in some cases, control information may also be transmitted).
  • PUSCH Physical Uplink Shared Channel
  • PUCCH for one UE is allocated to an RB pair in a subframe.
  • Resource blocks belonging to a resource block pair occupy different subcarriers in each of a first slot and a second slot.
  • the frequency occupied by RBs belonging to the RB pair allocated to the PUCCH is changed based on a slot boundary. This is called that the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary.
  • the UE may obtain frequency diversity gain by transmitting uplink control information through different subcarriers over time.
  • m is a location index indicating a logical frequency domain location of a resource block pair allocated to a PUCCH in a subframe.
  • the uplink control information transmitted on the PUCCH includes a hybrid automatic repeat request (HARQ) acknowledgment (ACK) / non-acknowledgement (NACK), a channel quality indicator (CQI) indicating a downlink channel state, and an uplink radio resource allocation request. (scheduling request).
  • HARQ hybrid automatic repeat request
  • ACK acknowledgment
  • NACK non-acknowledgement
  • CQI channel quality indicator
  • the PUSCH is mapped to the UL-SCH, which is a transport channel.
  • the uplink data transmitted on the PUSCH may be a transport block that is a data block for the UL-SCH transmitted during a transmission time interval (TTI).
  • the transport block may be user information.
  • the uplink data may be multiplexed data.
  • the multiplexed data may be a multiplexed transport block and control information for the UL-SCH.
  • control information multiplexed with data may include a CQI, a precoding matrix indicator (PMI), a HARQ, a rank indicator (RI), and the like.
  • the uplink data may consist of control information only.
  • FIG. 7 is a comparative example of a single carrier system and a carrier aggregation system.
  • a single carrier in uplink and downlink.
  • the bandwidth of the carrier may vary, but only one carrier is allocated to the UE.
  • a carrier aggregation (CA) system a plurality of component carriers (DL CC A to C, UL CC A to C) may be allocated to the UE.
  • a component carrier (CC) means a carrier used in a carrier aggregation system and may be abbreviated as a carrier. For example, three 20 MHz component carriers may be allocated to allocate a 60 MHz bandwidth to the UE.
  • the carrier aggregation system may be classified into a contiguous carrier aggregation system in which aggregated carriers are continuous and a non-contiguous carrier aggregation system in which aggregated carriers are separated from each other.
  • a carrier aggregation system simply referred to as a carrier aggregation system, it should be understood to include both the case where the component carrier is continuous and the case where it is discontinuous.
  • the number of component carriers aggregated between the downlink and the uplink may be set differently. The case where the number of downlink CCs and the number of uplink CCs are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation.
  • the target carrier may use the bandwidth used by the existing system as it is for backward compatibility with the existing system.
  • the 3GPP LTE system supports bandwidths of 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz, and the 3GPP LTE-A system may configure a bandwidth of 20 MHz or more using only the bandwidth of the 3GPP LTE system.
  • broadband can be configured by defining new bandwidth without using the bandwidth of the existing system.
  • the system frequency band of a wireless communication system is divided into a plurality of carrier frequencies.
  • the carrier frequency means a center frequency of a cell.
  • a cell may mean a downlink frequency resource and an uplink frequency resource.
  • the cell may mean a combination of a downlink frequency resource and an optional uplink frequency resource.
  • CA carrier aggregation
  • the UE In order to transmit and receive packet data through a specific cell, the UE must first complete configuration for a specific cell.
  • the configuration refers to a state in which reception of system information necessary for data transmission and reception for a corresponding cell is completed.
  • the configuration may include a general process of receiving common physical layer parameters required for data transmission and reception, media access control (MAC) layer parameters, or parameters required for a specific operation in the RRC layer.
  • MAC media access control
  • the cell in the configuration complete state may exist in an activation or deactivation state.
  • activation means that data is transmitted or received or is in a ready state.
  • the UE may monitor or receive the control channel (PDCCH) and the data channel (PDSCH) of the activated cell in order to identify resources allocated to the UE (which may be frequency, time, etc.).
  • PDCCH control channel
  • PDSCH data channel
  • Deactivation means that transmission or reception of traffic data is impossible, and measurement or transmission of minimum information is possible.
  • the UE may receive system information (SI) required for packet reception from the deactivated cell.
  • SI system information
  • the UE does not monitor or receive the control channel (PDCCH) and the data channel (PDSCH) of the deactivated cell in order to check resources allocated to it (may be frequency, time, etc.).
  • the cell may be divided into a primary cell, a secondary cell, and a serving cell.
  • a primary cell means a cell operating at a primary frequency, and is a cell in which a UE performs an initial connection establishment procedure or a connection reestablishment procedure with a base station, or is indicated as a primary cell in a handover process. It means a cell.
  • the secondary cell refers to a cell operating at the secondary frequency, and is established and used to provide additional radio resources once the RRC connection is established.
  • the serving cell is configured as a primary cell when the carrier aggregation is not set or the UE cannot provide carrier aggregation.
  • the term serving cell indicates a cell configured for the UE and may be configured in plural.
  • One serving cell may be configured with one downlink component carrier or a pair of ⁇ downlink component carrier, uplink component carrier ⁇ .
  • the plurality of serving cells may be configured as a set consisting of one or a plurality of primary cells and all secondary cells.
  • a plurality of component carriers (CCs), that is, a plurality of serving cells may be supported.
  • Such a carrier aggregation system may support cross-carrier scheduling.
  • Cross-carrier scheduling is a resource allocation of a PDSCH transmitted on another component carrier through a PDCCH transmitted on a specific component carrier and / or other components other than the component carrier basically linked with the specific component carrier.
  • a scheduling method for resource allocation of a PUSCH transmitted through a carrier That is, the PDCCH and the PDSCH may be transmitted through different downlink CCs, and the PUSCH may be transmitted through another uplink CC other than the uplink CC linked with the downlink CC through which the PDCCH including the UL grant is transmitted. .
  • a carrier indicator indicating a DL CC / UL CC through which a PDSCH / PUSCH for which PDCCH provides control information is transmitted is required.
  • a field including such a carrier indicator is hereinafter called a carrier indication field (CIF).
  • a carrier aggregation system supporting cross carrier scheduling may include a carrier indication field (CIF) in a conventional downlink control information (DCI) format.
  • CIF carrier indication field
  • DCI downlink control information
  • 3 bits may be extended, and the PDCCH structure may include an existing coding method, Resource allocation methods (ie, CCE-based resource mapping) can be reused.
  • FIG. 8 illustrates cross-carrier scheduling in a carrier aggregation system.
  • the base station may set a PDCCH monitoring DL CC (monitoring CC) set.
  • the PDCCH monitoring DL CC set is composed of some DL CCs among the aggregated DL CCs.
  • the UE performs PDCCH monitoring / decoding only for DL CCs included in the PDCCH monitoring DL CC set.
  • the base station transmits the PDCCH for the PDSCH / PUSCH to be scheduled only through the DL CC included in the PDCCH monitoring DL CC set.
  • PDCCH monitoring DL CC set may be set UE-specific, UE group-specific, or cell-specific.
  • three DL CCs (DL CC A, DL CC B, and DL CC C) are aggregated, and DL CC A is set to PDCCH monitoring DL CC.
  • the UE may receive the DL grant for the PDSCH of the DL CC A, the DL CC B, and the DL CC C through the PDCCH of the DL CC A.
  • the DCI transmitted through the PDCCH of the DL CC A may include the CIF to indicate which DCI the DLI is.
  • FIG. 8 illustrates cross-carrier scheduling in a carrier aggregation system.
  • the base station may set a PDCCH monitoring DL CC (monitoring CC) set.
  • the PDCCH monitoring DL CC set is composed of some DL CCs among the aggregated DL CCs.
  • the UE performs PDCCH monitoring / decoding only for DL CCs included in the PDCCH monitoring DL CC set.
  • the base station transmits the PDCCH for the PDSCH / PUSCH to be scheduled only through the DL CC included in the PDCCH monitoring DL CC set.
  • the PDCCH monitoring DL CC set may be configured UE specific, UE group specific, or cell specific.
  • three DL CCs (DL CC A, DL CC B, and DL CC C) are aggregated, and DL CC A is set to PDCCH monitoring DL CC.
  • the UE may receive the DL grant for the PDSCH of the DL CC A, the DL CC B, and the DL CC C through the PDCCH of the DL CC A.
  • the DCI transmitted through the PDCCH of the DL CC A may include the CIF to indicate which DCI the DLI is.
  • the PDCCH is monitored in a limited region called a control region in a subframe, and the CRS transmitted in all bands is used for demodulation of the PDCCH.
  • the types of control information are diversified and the amount of control information is increased, the scheduling flexibility is inferior only with the existing PDCCH.
  • EPDCCH enhanced PDCCH
  • 9 is an example of a subframe having an EPDCCH.
  • the subframe may include zero or one PDCCH region and zero or more EPDCCH regions.
  • the EPDCCH region is a region where the wireless device monitors the EPDCCH.
  • the PDCCH region is located in up to four OFDM symbols before the subframe, but the EPDCCH region can be flexibly scheduled in the OFDM symbols after the PDCCH region.
  • One or more EPDCCH regions are assigned to the wireless device, and the wireless device may monitor the EPDCCH in the designated EPDCCH region.
  • the information about the number / location / size of the EPDCCH region and / or subframes to monitor the EPDCCH may inform the base station through an RRC message to the wireless device.
  • the PDCCH may be demodulated based on the CRS.
  • a DM (demodulation) RS rather than a CRS, may be defined for demodulation of the EPDCCH.
  • the associated DM RS may be sent in the corresponding EPDCCH region.
  • Each EPDCCH region may be used for scheduling for different cells.
  • the EPDCCH in the EPDCCH region may carry scheduling information for the primary cell
  • the EPDCCH in the EPDCCH region may carry scheduling information for the secondary cell.
  • the same precoding as that of the EPDCCH may be applied to the DM RS in the EPDCCH region.
  • the EPDCCH is transmitted in the existing PDSCH region, and has a characteristic of obtaining beamforming gain and spatial diversity gain according to a transmission type.
  • EPDCCH since EPDCCH transmits control information, it requires higher reliability than data transmission, and in order to satisfy this, the concept of an aggregation level is used to lower a coding rate. High aggregation levels can increase the demodulation accuracy because the coding rate can be lowered, but the performance is reduced due to the increased resources used.
  • 10A exemplarily illustrates a new carrier for a next generation wireless communication system.
  • a reference signal, a synchronization signal, a control channel, etc. are transmitted through a downlink carrier.
  • the downlink carrier based on 3GPP LTE / LTE-A is called a legacy carrier.
  • a new carrier may be introduced to mitigate interference between a plurality of serving cells and to improve carrier scalability. This is called an extension carrier or a new carrier type (NCT).
  • a cell based on an extended carrier is called an extended cell.
  • Such NCT may be used by the existing macro cell 200.
  • the NCT may be used by one or more small cells 300 (or also referred to as picocells, femtocells, or microcells) that are located within existing macro cell 200 coverage and have low power transmission power.
  • NCT may be used as the primary cell (ie, PCell), it is contemplated that NCT is mainly used only as a secondary cell (ie, SCell) together with a conventional type of primary cell (ie, PCell).
  • a conventional subframe is used in the primary cell (ie, PCell) and an NCT subframe is used in the secondary cell (ie, SCell)
  • the setting for the subframe may be signaled through the secondary cell (ie, the SCell).
  • the secondary cell (ie SCell) in which the NCT subframe is used may be activated by the primary cell (ie PCell).
  • the existing UEs do not need to perform cell detection, cell selection, and cell reselection of the secondary cell using the NCT.
  • the NCT used only as the secondary cell cannot be recognized by existing UEs, unnecessary elements can be reduced as compared to the existing secondary cell, thereby enabling more efficient operation.
  • CRS may be called a tracking RS (TRS) or an enhanced synchronization signal (eSS) or a reduced CRS (RCRS).
  • TRS tracking RS
  • eSS enhanced synchronization signal
  • RCRS reduced CRS
  • This TRS may be transmitted through one RS port. Such a TRS may be transmitted through all frequency bands or some frequency bands.
  • the PDCCH is demodulated based on the CRS, but the PDCCH may not be transmitted in the NCT.
  • NCT only data demodulation is used for DMRS (or URS).
  • the UE receives downlink data based on DMRS (or URS), and measures channel state based on CSI-RS transmitted at a relatively low frequency.
  • DMRS or URS
  • NCT minimizes the overhead due to the reference signal, thereby improving reception performance and enabling efficient use of radio resources.
  • 10B is a diagram illustrating an environment of a mixed heterogeneous network of macro cells and small cells, which may be a next generation wireless communication system.
  • the macro cell 200 illustrates a heterogeneous network environment in which one or more small cells 300a, 300b, 300c, and 300d overlap.
  • the service of the macro cell 200 is provided by a macro base station (Macro eNodeB, MeNB).
  • a macro base station Macro eNodeB, MeNB
  • the macro cell and the macro base station may be used interchangeably.
  • the UE connected to the macro cell 200 may be referred to as a macro UE.
  • the macro UE receives a downlink signal from the macro base station and transmits an uplink signal to the macro base station.
  • the macrocell is set as the primary cell and the small cell is set as the secondary cell, thereby filling the coverage gap of the macrocell.
  • the small cell is set as the primary cell (Pcell) and the macro cell as the secondary cell (Scell), it is possible to improve the overall performance (boosting).
  • the small cell may use a frequency band currently allocated to LTE / LTE-A or use a higher frequency band (eg, a band of 3.5 GHz or more).
  • a frequency band currently allocated to LTE / LTE-A or use a higher frequency band (eg, a band of 3.5 GHz or more).
  • the small cell is not used independently, it is also considered to use only as a macro-assisted small cell (macro-assisted small cell) that can be used with the help of the macro cell.
  • Such small cells 300a, 300b, 300c, and 300d may have a similar channel environment, and because they are located at close distances to each other, interference between small cells may be a big problem.
  • small cells 300b and 300c may expand or reduce their coverage. Such expansion and contraction of coverage is called cell breathing. For example, as shown, the small cells 300b and 300c may be turned on or off depending on the situation.
  • EPDCCH ICIC inter cell interference coordination
  • the PDSCH of the neighbor cell is a source of interference and when the EPDCCH is a source of interference, different interference mitigation techniques may be required. That is, when the EPDCCH of the neighboring cell is the source of interference, the interference characteristics are different for each ECCE (or for each EREG) within one PRB pair, and it may be difficult to distinguish different interferences within the PRB pair due to the characteristics of the EPDCCH.
  • EPDCCH interference management between small cells will be mainly described. However, this description may also be applied to EPDCCH interference management between macro cells or between macro cells and small cells.
  • FIG. 11 shows an example of interference management of an EPDCCH on a subframe basis according to the first disclosure of the present specification.
  • the index m of a cell capable of transmitting EPDCCH through k subframes among M cells having M-1 may be determined according to (k mod M).
  • a cell capable of transmitting EPDCCH in a specific subframe may be configured differently for each PRB or PRB group.
  • the PRB area in which the EPDCCH can be transmitted is divided into a plurality of PRB groups or PRB bundles
  • the cell index m 0, 1,...
  • the index m of a cell capable of transmitting the EPDCCH through the PRB group / PRB bundle of subframe k of the k subframes among M cells having M ⁇ 1 may be determined according to (k + g) mod M.
  • the PRB group or PRB bundle may consist of one PRB.
  • the PRB region (PRB set for EPDCCH) of the EPDCCH to be used by a specific UE in a specific cell may be configured as one or several PRB bundles or PRB groups.
  • a PRB region in which an EPDCCH is actually transmitted for a specific UE in a specific cell within a corresponding PRB bundle or PRB group may be configured as some PRBs in the corresponding PRB bundle or PRB group.
  • cell # 1 may inform the UE that should receive the EPDCCH that the EPDCCH can be transmitted on a specific PRB bundle or PRB group.
  • the actual PRB area where the UE receives the EPDCCH from cell # 1 may be a part of the PRB bundle or a PRB in the PRB group.
  • some PRB regions in which the UE receives the EPDCCH in the PRB bundle or the PRB group may vary according to the cell ID.
  • the index of the RPB region in which the UE can receive the EPDCCH in a PRB bundle or PRB group including M PRBs may be determined according to cell ID mod M.
  • some PRB resources in which the UE receives the EPDCCH from a specific cell in the PRB bundle or the PRB group may be determined differently according to the subframe index.
  • a cell that is not configured to perform EPDCCH ICIC in a specific PRB region of a specific subframe cannot transmit EPDCCH in the corresponding PRB region, and may also transmit another signal / channel in the corresponding PRB region. It may be necessary to perform zero-power transmission without transmitting.
  • a cell that is not configured to perform EPDCCH ICIC in a specific PRB region of a specific subframe performs zero-power transmission without transmitting other signal / channel except CRS or TRS in the corresponding PRB region. You may have to.
  • FIG. 12 illustrates an example in which interference management of an EPDCCH based on subframes according to the first disclosure of the present specification illustrated in FIG. 11 is applied.
  • the macro cell when the macro cell 200 and the small cells 300a, 300b, and 300c are mixed, the macro cell operates as a primary cell of the UE, and the small cell It may be set as a secondary cell (Scell).
  • the first UE 100a uses the macro cell 300 as the primary cell and the first small cell 300a as the secondary cell.
  • the second UE 100b uses the macro cell 300 as the primary cell and uses the third small cell 300c as the secondary cell.
  • each small cell may be configured to transmit the EPDCCH only through a specific subframe for EPDCCH ICIC between the small cells.
  • the second small cell 300b may serve to assist the macro cell 200.
  • backhaul signaling between cells operating / controlling each cell to perform the EPDCCH ICIC scheme according to the first disclosure. signaling may be used to adjust the EPDCCH resources used in each cell.
  • the macro cell 200 may inform information on a resource to be used by small cells to transmit the EPDCCH through backhaul signaling.
  • the information on resources to be used by each small cell to transmit the EPDCCH may include the following.
  • PRB (group) index field All or part of PRB area information on which EPDCCH can be transmitted. This field may mean the index of EPDCCH-PRB-set.
  • Subframe interval and offset field subframe position information capable of transmitting EPDCCH in the PRB region indicated through the PRB (group) index field. If the PRB (group) index field does not exist, this field may indicate subframe position information capable of transmitting EPDCCH in the entire PRB region.
  • each UE attempts to receive the EPDCCH through the small cell in the subframe in which the EPDCCH can be received from the small cell (that is, does not use cross-carrier scheduling), and the subDC cannot transmit the EPDCCH onto the small cell.
  • it may attempt to receive the EPDCCH through the macro cell (primary cell) (using cross carrier scheduling).
  • the first UE 100a uses the macro cell 200 as the primary cell and the first small cell 300a as the secondary cell, as shown in FIG. 12A
  • the first small cell ( 300a, that is, the secondary cell may transmit EPDCCH at intervals of a subframe (for example, subframe k, subframe k + a, subframe k + 2a, ). In this case, as shown in FIG.
  • the first UE 100a may include a subframe in which the EPDCCH may be received from the first small cell 300a, that is, the secondary cell (eg, subframe k, In subframe k + a, subframe k + 2a, ...), it is possible to attempt reception of EPDCCH without applying cross-carrier scheduling.
  • the secondary cell e.g, subframe k, In subframe k + a, subframe k + 2a, .
  • cross carrier scheduling may be applied to receive the EPDCCH from the macro cell, that is, the primary cell.
  • FIG. 13 shows an example of interference management of an EPDCCH through scheduling for multiple subframes according to the second disclosure of the present specification.
  • only one downlink (DL) data or uplink (UL) data may be scheduled through one downlink grant or uplink grant.
  • the DL data or UL data is transmitted using one DL subframe or UL subframe.
  • the DL grant transmitted on the n subframe previously schedules the PDSCH of the same n subframe
  • the UL grant transmitted on the k subframe may schedule the PUSCH of the k + 4 subframe.
  • This approach is called single-subframe scheduling.
  • the second disclosure of the present specification proposes a multi-subframe scheduling scheme or a cross-subframe scheduling scheme.
  • the multi-subframe scheduling enables one DL grant or UL grant to simultaneously schedule a plurality of downlink data or uplink data for the purpose of improving spectral efficiency.
  • the plurality of downlink data or uplink data may be sequentially transmitted through a plurality of predetermined DL / UL subframes.
  • a DL grant transmitted on subframe k may schedule a PDSCH transmitted on another subframe other than subframe n.
  • the UL grant transmitted on subframe k may schedule PUSCHs of other subframes other than k + 4.
  • specific cells according to the second disclosure may be assigned to DL grants for a plurality of subframes through multiple subframe scheduling.
  • the UL grant may be transmitted on subframe k.
  • the cell when a subframe in which a specific cell can transmit an EPDCCH after subframe k is a subframe k + a, the cell is subframe k.
  • the subframe that can be scheduled by the DL grant transmitted by the cell on subframe k may include a subframe consecutive from subframe k.
  • the specific cell when a subframe in which a specific cell can transmit the EPDCCH after subframe k is a subframe k + a, the specific cell is subframe k.
  • the subframe that can be scheduled by the UL grant transmitted by the specific cell on subframe k may include a subframe consecutive from subframe k + 4.
  • FIG. 14 shows an example for interference management of an EPREGCH based on an EREG / ECCE unit according to the third disclosure of the present specification.
  • the first small cell 300a and the second small cell 300b are in a coexistence channel environment, and the first small cell 300a transmits an EPDCCH to the first UE 100a.
  • the second small cell 300b transmits the EPDCCH to the second UE 100b.
  • the first small cell 300a and the second small cell 300b may minimize interference to each other by transmitting the EPDCCH through resources that do not overlap each other.
  • each cell may not transmit the EPDCCH on an RE resource through which another cell transmits the EPDCCH, and may also need to perform zero-power transmission without transmitting another signal / channel. In this case, each cell may need to perform zero-power transmission without transmitting other signals / channels except for CRS or TRS (tracking reference signal) on the RE resources through which other cells transmit EPDCCH.
  • CRS centroid reference signal
  • FIG. 15 shows an example of interference management of an EPREGCH based on an EREG unit according to the third disclosure of the present specification.
  • one EPDCCH transmission resource set to L includes L ECCE sets.
  • one ECCE consists of four EREGs, and one EREG consists of nine REREGs.
  • One PRB is composed of a total of 16 EREGs, and an RE included in each EREG within one PRB is shown in FIG. 15. In FIG. 15, nine REs denoted by the same numeral are included in one EREG, and one PRB includes a total of 16 EREGs, ranging from an EREG of zero REs to an EREG of 15 REREGs.
  • the EPDCCH may be transmitted using only some EREGs of the 16 EREGs included in one PRB.
  • EREGs that each cell can use for transmission of EPDCCH in one PRB may be determined so as not to overlap each other.
  • cell index m 0, 1,...
  • the index of the EREG that each cell can use for transmission of the EPDCCH in a specific PRB may be determined differently for each subframe.
  • an index of EREG that a specific cell can use for transmission of EPDCCH is k_1, k_2,... , k_R
  • the index of the EREG that the specific cell can use for transmission of the EPDCCH in the next subframe is (k_1 + 1) mod 16, (k_2 + 1) mod 16,.
  • the index of the EREG that each cell can use for transmission of the EPDCCH may be determined differently for each PRB in one subframe.
  • the index of EREG that a specific cell can use for transmission of EPDCCH in a specific PRB is k_1, k_2,... , k_R
  • the index of the EREG that the cell can use for transmission of the EPDCCH in the next PRB is (k_1 + 1) mod 16, (k_2 + 1) mod 16,. , (k_R + 1) mod 16
  • each cell may adjust an EREG resource to be used for transmission of the EPDCCH through backhaul signaling to perform the EPDCCH ICIC scheme.
  • the macro cell performs transmission of EPDCCH through backhaul signaling to perform the EPDCCH ICIC scheme.
  • Each small cell can be told which EREG resource it will use.
  • 16A to 16C illustrate an example of interference management of an ECCE unit based EPDCCH according to a third disclosure of the present specification.
  • one cell may transmit an EPDCCH using only some ECCEs among four ECCEs included in one PRB. Therefore, the plurality of cells may prevent ECCE resources used for transmission of the EPDCCH from overlapping each other.
  • EREG set 1 ⁇ 1, 5, 9, 13 ⁇ ,
  • EREG set 2 ⁇ 2, 6, 10, 14 ⁇ ,
  • EREG set 3 ⁇ 3, 7, 11, 15 ⁇
  • the EREG set 0 includes EREGs of 0, 4, 8, and 12.
  • one EPDCCH-PRB-set includes L ECCEs. Therefore, ECCEs for transmitting an EPDCCH by a specific cell may include only the following ECCEs.
  • EREG_SET_m for a cell having a cell index of m is equal to the union of EREG set 1 and EREG set 2
  • ECCEs for EPDCCH of the corresponding cell are equal to 0 among REs shown in FIG. 16A. All or part of the REs marked 1 shall be transmitted on the RE.
  • EREG_SET_1 EREG set 1 ⁇ EREG set 2
  • the first cell transmits the EPDCCH to the first UE and the second UE
  • the second cell transmits the EPDCCH to the third UE
  • the first cell uses the EREGs included in EREG_SET_1 as shown in FIG. 16B.
  • the second cell may transmit the EPDCCH of the third UE using the EREGs included in the EREG_SET_2.
  • the transmission region of the EPDCCH used by the first cell and the transmission region of the EPDCCH used by the second cell do not overlap each other.
  • FIG. 17 illustrates an example of managing DMRS resources in order to efficiently manage interference of an EPDCCH according to a fourth disclosure of the present specification.
  • the EPDCCH ICIC may be attempted by changing the resources of the EPDCCHs transmitted to each other.
  • the resources of the DMRS transmitted by each cell may not be overlapped.
  • DMRS ports 107 and 109 may be used for the first cell and DMRS ports 108 and 110 may be used for the second cell.
  • up to two EPDCCHs per RPB may be multiplexed.
  • the sum of the number of DMRS ports between N cells transmitting the EPDCCH in a specific PRB may be less than or equal to four.
  • the number of DMRS ports between N cells transmitting EPDCCH in a specific PRB may be less than or equal to 4 / N.
  • EPDCCHs of up to four cells per RPB per PRB may be multiplexed.
  • the DMRS RE resources transmitted by each cell in the corresponding PRB can be prevented from overlapping DMRS resources used by each cell.
  • 6 DMRS REs exist for one port in one PRB when M cells transmit EPDCCHs on the same PRB, 6 / M DMRS REs per port may be used for each cell.
  • the DMRS RE resource used by each cell is different from that shown in FIG. It can be divided and used together.
  • DMRS RE resources used by each cell may be divided and used as shown in FIG. 17 (b). have.
  • the DMRS used for demodulation of the EPDCCH of the corresponding UE is the EPDCCH PRB set / PRB bundle / PRB in which the EPDCCH is received. It may be received through some PRB areas of the group.
  • the EPDCCH PRB set / PRB bundle / PRB group to which the EPDCCH is transmitted is configured with 4 PRBs, and 4 cells transmit EPDCCH to each UE through the corresponding PRB region.
  • cell n may transmit DMRS through the (n mod 4) PRB region.
  • a PRB region used by a specific cell to transmit DMRS in an EPDCCH PRB set / PRB bundle / PRB group to which an EPDCCH is transmitted may be set differently for each subframe index.
  • a PRB region in which a DMRS is received for a specific UE to use for demodulation of a specific EPDCCH may be set separately from a PRB region in which an EPDCCH is transmitted to a corresponding UE.
  • a PRB region in which a DMRS to be used for demodulation of a specific EPDCCH is transmitted by a specific UE may be set semi-fixed from the corresponding cell or may be set differently for each subframe (or bundle of subframes).
  • the PRB region in which DMRS to be used for demodulation of a specific EPDCCH is transmitted may be set together when the EPDCCH-PRB-set is configured for the UE.
  • Embodiments of the present invention described so far may be implemented through various means.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof. Specifically, it will be described with reference to the drawings.
  • FIG. 19 is a block diagram illustrating a wireless communication system in which a disclosure of the present specification is implemented.
  • the base station 200/300 includes a processor 201/301, a memory 202/302, and an RF unit (radio frequency) unit 203/303.
  • the memory 202/302 is connected to the processor 201/301 and stores various information for driving the processor 201/301.
  • the RF unit 203/303 is connected to the processor 201/301 to transmit and / or receive a radio signal.
  • Processors 201/301 implement the proposed functions, processes, and / or methods. In the above-described embodiment, the operation of the base station may be implemented by the processor 201/301.
  • the MTC device 100 includes a processor 101, a memory 102, and an RF unit 103.
  • the memory 102 is connected to the processor 101 and stores various information for driving the processor 101.
  • the RF unit 103 is connected to the processor 101 and transmits and / or receives a radio signal.
  • the processor 101 implements the proposed functions, processes and / or methods.
  • the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
  • the RF unit may include a baseband circuit for processing a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in memory and executed by a processor.
  • the memory may be internal or external to the processor and may be coupled to the processor by various well known means.

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Abstract

La présente invention concerne, dans un de ses modes de réalisation, un procédé de réception d'un canal physique amélioré de commande en liaison descendante (EPDCCH) en provenance d'une petite cellule disposant d'une faible puissance d'émission. Le procédé de réception peut comporter les étapes consistant à: recevoir des informations d'ensemble EPDCCH-PRB comprenant des informations concernant un bloc de ressources physiques (PRB) appelé à recevoir l'EPDCCH en provenance de la petite cellule; et à déterminer une sous-trame qui sera reçue par l'EPDCCH en provenance de la petite cellule sur le PRB vérifié par les informations d'ensemble EPDCCH-PRB. Ici, la sous-trame susceptible d'être reçue par l'EPDCCH en provenance de la petite cellule peut être déterminée de façon à ne pas recouvrir une sous-trame émise par l'EPDCCH au moyen d'une ou de plusieurs cellules voisines.
PCT/KR2014/004315 2013-05-31 2014-05-14 Procédé et terminal de réception d'un epdcch en provenance d'une petite cellule disposant d'une faible puissance d'émission WO2014193104A1 (fr)

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